1. The problem statement, all variables and given/known data Given: 5x10^21 Phosphorous atoms/m^3 in solid solution in silicon Find: atomic percent and weight percent of Phosphorous atoms 3. The attempt at a solution I know how to solve for at. % and wt. % when given two values, I am not sure how to get the second value given the mixture is a "solid solution" Do i have enough information to solve this? Solid solution means that it is completely mixed, but how would that lead me to a density of silicon that I could used to solve for at.% and wt.%?